class_docstr: Represents a resource requirement in an execution environment for an operator.
  
  :param name: Name of the resource
  :param units_str: The string representing the units of a resource (e.g. MB for a CPU
      resource) to be used for display purposes
  :param qty: The number of units of the specified resource that are required for
      execution of the operator.
code: def __repr__(self):
      return str(self.__dict__)
  
imports: from __future__ import annotations
  from airflow.configuration import conf
  from airflow.exceptions import AirflowException
label_desc: Use image node_id 3 for calling the Resource obj's underlying member method code with example usage: obj.__repr__() and returns: str